Caution: Avoid breathing fumes and swallowing EGR exhaust deposits when removing
components for cleaning as bodily injury may result.
- Remove the exhaust gas
recirculation (EGR) valve. Refer to
Exhaust Gas Recirculation Valve Replacement
.
- Depress the pintle several times using a pencil eraser or other
suitable soft instrument. The pintle should move in and out smoothly. Replace
the valve if the valve exhibits tendencies to stick.
- Try to rotate the EGR valve electrical connector housing. Repeat
for the coil housing. Replace the valve if the valve exhibits any looseness.
- Inspect the EGR valve pintle and seat for deposits. Use a cloth
or other suitable soft device to remove the deposits. Remove all loose particles.
Replace the valve if the deposits are such that the pintle
to base interface cannot be cleaned adequately to allow
the pintle to seal against the seat. Damage to the powdered
metal EGR valve base occurs if cleaned with solvents, sharp
tools, wire brush or wheel, or sand blasting. Cleaning by these
methods is not recommended.
- Remove the EGR pipe. Refer
to
Exhaust Gas Recirculation Valve Replacement
.
- Clean the passages with a wire brush. Remove all loose particles.
- Install the EGR pipe. Refer to
Exhaust Gas Recirculation Pipe Replacement
.
- Install the EGR valve. Refer to
Exhaust Gas Recirculation Valve Replacement
.